To program is human, to instrument is divine. Complex systems
that will support a heavy workload will eventually have to be
tuned for it. There are two prerequisites for tuning: tunability,
and measurability.

Tunability generally means configuration settings. Adding
configuration settings is a sign of a humble and wise programmer.
It means that the programmer acknowledges “I don’t understand how
this system will be used, what environment it will run in, or
even what my code really does.” Sometimes things are hard-coded.
InnoDB is notorious for this, although don’t take that to mean
that I think Heikki Tuuri isn’t humble and wise — …

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